Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ba37bc0466e9d9…

MALICIOUS

PDF

99.7 KB Created: 2021-09-11 20:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d820374b7efc0a303bae0c3502078214 SHA-1: aed961ccd14c80e967ec3668d2a56eb1feaf11f7 SHA-256: 21ba37bc0466e9d9409549b7f4d68fc0e582aab36d2e2a1cf80133f808d1728b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised upload directories on websites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using compromised or disposable hosting for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tapuionoticias.com/ckfinder/files/mojeba.pdf In PDF document text
    • http://garageanything.com/js/upload/files/nanojikev.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/47401840662.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k5elk55jg1d2rlbeeq9qhdk473/magegafezavaguxizabapeji.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/27bn275icdsagqeb085p52ba85/dajevuxonavinexisunovi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/vilobeleraxegavow.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109071525417749.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28196426543.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/jugofinetelutiwomubo.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/81127761606.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/pizometifusevelojug.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gipabatovof.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/47791868004.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109040423133162.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/37707529524.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/80591409535.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4rll660d6ph1e7a5a82bi3r1g5/57274014764.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/83487837514.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/11031800925.pdfIn PDF document text
    • https://31app.com/userfiles/file/96380313420.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c329c2ac3b---13773690877.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/sofodawafixumasa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d3f2c83d52ccb420a44654e78d9dca57/5183001024.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/14474697234.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/dinuradejunotaxilenif.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210901090349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=flashpoint+paradox+kisscartoonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 18500 bytes
SHA-256: f193da9e75fce7ce0f18759e6d5ed0734f30a97454e4b63d4e0a62267aeb77d4
font_01_sfnt_off000150bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BD 10648 bytes
SHA-256: 26ac652e1d3541840b4986ae61970c53b4dd5b9a3912b9ef3eee02cff92086e6
font_02_sfnt_off0001690e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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